What is a ClosedLoop?
Support » FAQ » Stepper motors
A ClosedLoop is a stator space vector monitor and evaluates the angular position of the stator vector. The speed of the motor or the current level is derived from the variance.
Drive systems with stepper motors, therefore, carry out a reference run after the system start. This referencing is also required during normal operation when the user must assume losses of step due to overload or process-dependent lockouts.
The positioning controls of the SMCI series and the Plug & Drive motors already include an integrated ClosedLoop function and can automatically balance this at the end of the positioning run if there is a loss of step.
For closed loop operation, a 3-channel encoder or encoder with min. 500 pulses/rev. must be mounted in the SMCI positioning controls whereas this can already be integrated in the Plug & Drive motors.
From fall 2008 our positioning controls will also include an integrated dynamic closed loop and cannot only compensate step angle errors during the travel, but can correct and track load angle errors within a full step.
Hence, the stepper motors reach similar dynamic behavior to the highly dynamic servomotors (up to around 2000 rpm).
In addition to the high dynamics they also reach higher speeds, have no resonance points even at low speed ranges, are significantly quieter (noiseless) and, above all, have a considerably higher efficiency because they generate the same power with less current while remaining significantly cooler, and ultimately energy sources are reduced.
If you have further questions regarding our closed loop system, please contact us: Contact.
